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Tank deforming/bulging anyone?

I was waxing the bike the other day and noticed this on the tank
It wasn't there before because I wax my bike weekly and usually, the tank- both its flat and curved areas were pefectly smooth.
I don't know what have caused it, the heat/pressure/ or whatever else because I live in Southern Louisiana and it's Dante's down here!
I checked the black RSV4 and it too has it on one side of the tank and not both like mine, whereas the Factory is buttery smooth

have you removed the EVAP canister and check valve from the vent line? The pressure is caused by those 2 pieces as they dont allow enough of the fumes to escape from the tank when the fuel gets hot and expands.

hmm this is interesting since I've noticed the same thing as well. I will have to talk to my dealer to see what they would do since my tank had to be resprayed when I went down at the track months ago.

Mine swells with pressure even with the evap can removed. But it hasn't deformed any.

double check your vent lines.....they both should allow air to go both ways......sounds like you might still have the one-way valve on the tank vent or one line pinched behind the sprocket cover. It is not supposed to be there, and there should really be very little to no pressure in the tank with the EVAP can removed properly.

Yeah, I brought mine to the dealer and had it examined. I also called Ape USA and expressed the situation to them as well. It appears then that the problem of my tank isn't unique, a sigh of relief I guess.

I had a similar issue with my superduke - the tank swelled to the point that the front bolt could not be re-threaded. The bike was out of warranty, but KTM replaced the tank and I was only charged 2 hours labor (to swap the fuel pump, etc).

Word is the replacement will take a while because it's in back ordered status. This sucks but it might be that my issue isn't unique, I hope a clear explanation/solution can surface??

This will happen again and again unless they find a way to treat the plastic inside the tank or use a different material for the tank altogether. Replacing the current production plastic tank with another one will not solve the problem, it will just happen again, just like with Ducati...